Boat construction



Dec. 8, 1931. w. (2. GRAYSON ET AL BOAT CONSTRUCTION m W M N I Patented Dec. -8, 1931 UNITED STATES PATENT OFFICE WILLIAM C. GRAYSON AND WILLIAM GBANT, OIE SAN FRANCISCO, OALHOBNIA;AB-

SIGNORS, IBY MESNE-ASSIGNMENTS, T SAID WILLIAM C. GRAYSON BOAT consrwrron Aplication fi1d April 19,

and the like, but more particularly to improvements in the structional design of the hull bottoms including the keel and stem sections thereof.

Specifically, the invention involves a novel combination of hull bottom and stem section so designed and arranged as to rovide a V-shaped forward sect1on.exten ing from the bow to a point beyond midships, this forward section being thereafter inverted at the stem and providing an open inverted V- 'shaped stem section, the forward section and stem section merging togther in a graceful upward and sternward sweep.

.The objects of the invention are manifold the primary object being the provision of a boat having a streamline stem section of inverted open V-form adapting it to ride the water in a fashion similar to that of 'Wi hgs of an .areoplae in banking the air while in fli ht, the hull and stem as thus formed conotming to the wave created by the boats forward motion in the water, thereby completely utilizing th lifting power of the waterunder the hull of the .boat.

Another object of the invention is the provision of a boat hull of the class described in which the entire hull rides on top of the water in a manner termed three point suspension, that is, it rides on the'keel in the bow section and on the. chines in the stem section, the bow or stem cutting the water as the boat is driven therethrough.

Another object of the invention is the provision of a boat of the class described Which ihbodieS in its construction au offset keel,

' that is, the keel.is upwardly curved in the stem end t0 permit inversion of the fore and aft seotionsrelative to each other.

Another object of the invention is the provision of a boat having better stability than the ordinary boat due to the inverted V- shaped stem section thereof.

Another object of the invention is the provision of a boat of the class described which requires less driving power at maximum speed on account of its riding on top of the V-shaped forward section 0 ciency and prolongationof the life 0 bout.

193o. Serial No. 445,639.

wave created by its own forward motion in the ,water.

Another object of the invention is the provision of a boat of the class described which is of shallow draft character due to the special design of its keel and stem sections.

Another object of the invention is the rovision of a boat of theclass described wiiich is more stable in the water than the usual boat and practically cannot be capsized.

Still another object of the invention is the provision of a boat which is steady in the water and does not roll in rough water, due primarily, to the inverted" V-shaped stem in conjunction with the ,dppositely formed the boat.

Still another object of the invention is the provision of a boat in which the propeller is always in solidly compressed water due to the shape of the stem end acting to compress the water thereunder.

Still another object of the invention is the provision of a boat Which rides more comfortabiy in the Water due to the compression of the water under the stem end, thuspreventing s0 called squatting in the Water, asis usual with most motor boats.

Another object of the invention is the provision of a boat in which the setting of the .,keel and the inversion of the stem end permits the engine to be placed in a more level position, thus providing for better oilin eifithe motor. s

Another object of the invention is the rovision of a boat having a stem section 0 the class described Which -permits setting of the heavir and more power'fuI engines in the extreme stem end, thus giving more power and tending to prevent fire frofn spreading to the forward part of the boat in emergenmes.

Ancillary to the foregoing objects is that of providirig a boat hull that due to the settingof its keel and inverted fore and aft sections, excessive pounding by the wavesis eliminated as the keel always cuts throu h the waves in the forward movement of t e,

Other objects and advantages of theinven:

tien Will becorhe apparent with reference to tor-boat having a hull,constructed in accordance with the invention;

Figure 2 is a stem view of the construction shown in Figure 1 and indicating the inverted V-shaped stern end of the boat;

Figure 3 is a stem end view of a slightly modified form in which the chines of the stem are shown rounded;

Figure 4 is a stem end view of another slightly modified form in which all sharp ed es have been eliminated; and

igure 5 is another modified form illustrating the stem end of a form adaptable to twin screw boats.

Referring more particularly to the drawings in which the preferred forms of the invention have been illustrated, the numeral 10-designates the boat hull in general compri sing the usual stem 11, bow 12, mid'ship section 13, stem section 14 and keel section 15.

The invention resides mainly in the formation of the underside of; the boat hull andincludes the V-shaped formation of the fore part of the hull, the inverted stern.section the'reof and the upwardly and sternwardly curved keel required for carrying out the construction.

The fore part 16 of the underside of the hull extending from the stem 11 aft to the oint 17 is constituted of a gradually dimin- 1shing V-shaped section and from the point 17 to the stem end 18 the bottom is reversed, thus providing an open inverted )l-shaped stem section 19 embodying a central apex section 20 and oppositely arranged chine sections 21 and 22.

The keel of the boat is substantially straight :from the stem 11 to the point 17 of in the various lengths of boats it remains the saine which is about eight feet from the stem end of the boat. The keel from the point 17 sweeps upwardly and sternwardly in a grace ful curve and terminatcs in a straight section substantially parallel with that of the forward section therof, as clearly shown in Figure 1, and thereby forms, togethr with the chines 21 and 22, the inverted V-shaped stem section of the boat.

It is obvious with reference to the drawings that the inversion of,the bottom of the hull of the boat centers et the point 17 of the keel 15, thereby creating a sternwardly extending and gradually d1minishing V-shaped bow section 16 which marges itself into a reversed or inverted V-shaped stem section 19 Vli0h completes the V-s aped stem of the The stem section, as indicated in Figure 2, indicates a. sharp. open inverted V-s haped Stem, hoWever,,as-indicated in Figures 3,

4 and 5 it has been shown modified by rounding the chines 21 and 22, or as indicated in Figure 4, the apex section may be rounded as indicated at 20 as well as the chine sections 21- and 22, however, the -preferred form of hull is indicated in Figures 1 and 2.

In Figure 5 still another form of hull and stem has been illustrated, and comprises, a stem of double inverted V-shaped form or in the form of an inverted W, and including the central section 23, inverted V-shaped channels 24: and 25 and the chines 26 and 27, this form being used in twin-screw constructions and requiring sub keels, not shown. A

It Will be observed that a boat constructed in accordance with the present invention not only presents a stream-line appearance but also embodies many features of superiority of constructionnot found in standard designs, among these being additional speed per horse power, safet reliability, comf0rt 'at any speed, adaptabi 'ty to shallow waters,

and perfect seaworthiness.

The inventors of the present boat constructidn are aware of the existence of variously formed hull constructions and that one in particular called the sea-sled embodies a substantially inverted V-shaped bottom, but in this design the entire bottom from stem to stem is identical in shape and does not function in a manner similar to the present construction.

The results obtained by actual tests with boats constructed in accordance with the present invention prove conclusively that the design is correct in all respects and that these boats are by far speedier, more seaworthy and reliable at less horse power than following: the keel, which pomt 1s beyond m1dsh1ps, or

1. A speed'boa't of the class described, comprising a hull having a keel extending from stem to stem and having a stem end thereof curved upwardly in a gracful sternward sveep, and terminating in a straight stem section occupying a horizontal plane seme- What higher than the straight stem section thereof. v

2. A boat of the class described, comprising a hull having its forward end embodying a Vshaped bottom gradally diminishing ster nwardly and merging into an inverted V-shaped stem section, and a keel extending from stem to stem of the boat, comprising a straight stem section and terminatin' in a straight stem section occupying a orizontal Plane above said stem section. V

3. A boat of the class dscribed, comprising a hull embodying a bow section and a stem section, a keel extending from stem to stern, the keel being offset et a point beyond'midshipsand terminting in a straight section occupying a plane higher than the stem section of said keel and forming a substantiail) inverted V-shaped stem section.

4. A boat comprising a forward V-shaped hull arranged with the keel at the apex of the V and an inverted V-shaped stem section the inversion occurring at a point sternwardly of the widest beam of the boat, and provided with a straight stem keel section occupying a higher plane than said keel at said apex.

5. A boat comprising a forward section e1'nbodying a V-shaped hull arranged with the keel constituting the apex of the V and having an inverted Vshaped stem section the two sections merging together in a gradual downward sweep toward the bow of the boat, said keelterfl1inating in a straight stem section occupying a higher plane than the stem section thereof.

6. A boat comprising a hull embodying a V-shaped bottom extending from the stem end thereof to a point beyond midships and a stem section comprising an inverted open V-shaped section extendmg from the stem end of the hull and merging into the forward V-shaped section of the hull,a keel merges from a Vshapd bow portion to an a keel extending throughout the length of the hull and terminating in a straight stem section occupyihg a higher plane than its stem section.

In testimony whereof we hereunto afiix our signatures.

WILLIAM C. GRAYSON. WILLIAM GRANT.

extending from stem to stem, the stem sectien thereof being substantially straight and occupying a higher plane than the stem section. A

7. A boat of the class described, comprising a hull having a keel extending from end to end thereof and curved upwardl sternwardly at the stem end of sai hull,

said keel forming the apex of oppositely disposed V-shaped sections, the stem end of the hull being of inverted V-shaped formation and merging into the forward V-shaped section at a point corresponding to the curved section of the keel, said keel terminat ing in a straight stem, section occupying a higher plane than the stem section thereof.

8. In a boat of the char'cter described, a

and

keel, a bow, a stem, sides, stabilizing chines and a bottom,,said bottom being provide With an under surface graduating rearwardl 'IOI1 V-shape to inverted V-shape throug a substantially horizontal plane at a point rearward from amidship, said keel extending rearward and terminating in a straight stern section occupying a higher horizontal plane than the stem section thereof.

9. A boat of the character descrihed provided with a bottom whose under surface graduates rearwardly from a V-shaped for- Ward portion through a substantially horizontal rearward central verted V-shaped rearport1on, the latter providing a'recess for the reception of driving shaft and propeller, and a keel extending throughout the length of the hull and terminatmg in a straight stem section occupying a higher plane thanits stem section.

ortion to an in- 10. A boat of the chaiacter desctibed provided with a bottom whose under surface 

